Add package update detection on Content tab (#13807)

builtin/mainmenu/content/update_detector.lua

@@ -0,0 +1,144 @@
+--Minetest
+--Copyright (C) 2023 rubenwardy
+--
+--This program is free software; you can redistribute it and/or modify
+--it under the terms of the GNU Lesser General Public License as published by
+--the Free Software Foundation; either version 2.1 of the License, or
+--(at your option) any later version.
+--
+--This program is distributed in the hope that it will be useful,
+--but WITHOUT ANY WARRANTY; without even the implied warranty of
+--MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+--GNU Lesser General Public License for more details.
+--
+--You should have received a copy of the GNU Lesser General Public License along
+--with this program; if not, write to the Free Software Foundation, Inc.,
+--51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+
+update_detector = {}
+
+
+if not core.get_http_api then
+	update_detector.get_all = function() return {} end
+	update_detector.get_count = function() return 0 end
+	return
+end
+
+
+local has_fetched = false
+local latest_releases
+
+
+local function fetch_latest_releases()
+	local version = core.get_version()
+	local base_url = core.settings:get("contentdb_url")
+	local url = base_url ..
+			"/api/updates/?type=mod&type=game&type=txp&protocol_version=" ..
+			core.get_max_supp_proto() .. "&engine_version=" .. core.urlencode(version.string)
+	local http = core.get_http_api()
+	local response = http.fetch_sync({ url = url })
+	if not response.succeeded then
+		return
+	end
+
+	return core.parse_json(response.data)
+end
+
+
+--- Get a table from package key (author/name) to latest release id
+---
+--- @param callback function that takes a single argument, table or nil
+local function get_latest_releases(callback)
+	core.handle_async(fetch_latest_releases, nil, callback)
+end
+
+
+local function has_packages_from_cdb()
+	pkgmgr.refresh_globals()
+	pkgmgr.update_gamelist()
+
+	for _, content in pairs(pkgmgr.get_all()) do
+		if content.author and content.release > 0 then
+			return true
+		end
+	end
+	return false
+end
+
+
+--- @returns a new table with all keys lowercase
+local function lowercase_keys(tab)
+	local ret = {}
+	for key, value in pairs(tab) do
+		ret[key:lower()] = value
+	end
+	return ret
+end
+
+
+local function fetch()
+	if has_fetched or not has_packages_from_cdb() then
+		return
+	end
+
+	has_fetched = true
+
+	get_latest_releases(function(releases)
+		if not releases then
+			has_fetched = false
+			return
+		end
+
+		latest_releases = lowercase_keys(releases)
+		if update_detector.get_count() > 0 then
+			local maintab = ui.find_by_name("maintab")
+			if not maintab.hidden then
+				ui.update()
+			end
+		end
+	end)
+end
+
+
+--- @returns a list of content with an update available
+function update_detector.get_all()
+	if latest_releases == nil then
+		fetch()
+		return {}
+	end
+
+	pkgmgr.refresh_globals()
+	pkgmgr.update_gamelist()
+
+	local ret = {}
+	local all_content = pkgmgr.get_all()
+	for _, content in ipairs(all_content) do
+		if content.author and content.release > 0 then
+			-- The backend will account for aliases in `latest_releases`
+			local id = content.author:lower() .. "/"
+			if content.type == "game" then
+				id = id .. content.id
+			else
+				id = id .. content.name
+			end
+
+			local latest_release = latest_releases[id]
+			if not latest_release and content.type == "game" then
+				latest_release = latest_releases[id .. "_game"]
+			end
+
+			if latest_release and latest_release > content.release then
+				ret[#ret + 1] = content
+			end
+		end
+	end
+
+	return ret
+end
+
+
+--- @return number of packages with updates available
+function update_detector.get_count()
+	return #update_detector.get_all()
+end